Cinematograph apparatus for reproduction in natural colors.



No. 676,532. Patented June :8, mm.

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CINEMATOGRAPH APPARATUS FOR REPRODUCTION IN NATURAL COLORS.

(Application filed June 23, 1900.)

(No Model.)

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UNITED STATES PAT T @EEicE.

WIIiLIAM NORMAN LASCELLES DAVIDSON, OF SOUTHIVICK, NEAR BRIGHTON,ENGLAND.

ClNEMATOGRAPH APPARATUS FOR REPRODUCTION IN NATURAL C OLORS.

SPECIFIGATION forming part of Letters Patent No. 67 6,532, dated June18, 1901.

Application filed June 23, 1900. Serial No. 21,357. (No model.)

To all whom it may concern:

Beit known that I, WILLIAM NORMAN LAS- CELLES DAVIDSON, ofRoseCottage,Southview road, Southwick, near Brighton, county of Sussex,England, have invented certain new and useful Improvements inCinematograph Apparatus for Reproduction in Natural Colors, of which thefollowing is a specification. l I

This invention relates to apparatus for use with cinematographs by meansof which photographs may be taken and reproduced in natural colors bythe well-known three-color process.

My apparatus consists, essentially, of, a three-color screen, which isplaced behind or in front of the revolving shutter already employed insuch apparatus. This screen is of vulcanite or other suitable materialand has three apertures filled in with celluloid or other transparentmaterial having the required colors. The revolving shutter engages thisscreen at every revolution, turning the three colors successively behindthe lens-aperture, so that each exposure is made with one color,

the colors rapidly succeeding one another during the operation. Forreproducing the photographs by an optical lantern or other suitablemeans a revolving screen is also employed, having openings filled inwith colored transparent material, thethree colors, however, being ofdifferentshades to the photographic color-screen. carried by similarbrackets, which can be fitted to the same parts of the apparatus.

In order that this invention may be more readily understood, referenceis had to the accompanying sheet of drawings, in which- Figure 1 is anelevation of part of the interior of a cinematograph apparatus, showingmy color-screen fitted to the revolving shutter at present employed.Fig. 2 is a similar view with the shutter andscreens removed to show thegearing. Fig. 3 is an elevation with the casein section at right anglesto Figs. 1 and 2. Fig. 4 shows the different form of screen moreespecially suitable for reproducing the photographs.

As the other parts of the apparatus are of any well-known construction,I have shown Both the screens are only those partswhich are necessary toan understanding of my invention.

A is the case of the apparatus, which is placed in front of the cameraor reproducing apparatus, and this case carries behind the lens-aperturethe revolving shutter 13, which is turned at high speed by suitablemechanism. In the apparatus shown the handle Z) serves to revolve theshutter through the toothed gearing b and the worm-wheels 11 one ofwhich is upon the spindle of the revolving shutter. These parts form nofeature of myinvention, and the shutter 13 may be rotated in. anyconvenient manner. In front of the revolving shutter is placed my threecolor screen 0, having the colored transparent plates 0 of the threecolors required fitted between the arms forming the body of the screen.As already mentioned,the body of the screen maybe formed of vulcanite orother light opaque material. This screen is carried by the detachablebracket D, the end of which is bent down and fixed by means of the plate01 to the side of the case A. The bracket is fixed so that the pivot ofthe screen is eccentric to the revolving shutter, and to adjust thetightness of the screen, preventing it turning too freely, the small nutc is employed,.which can tighten the screen to any required extent.

On the revolving shutter 13, I fix a pin Z), which projects from itssurface to a suitable height and is adapted to engage the corners ofthethrce arms forming my screen and to carry the screen around with theshutter the required" distance for each revolution. As the screcniseccentric to the shutter, the pin engages at each revolution with onearm, turns the screen over about one-third of a circle before itdisengages, and at the next revolution operates on the succeeding arm.Once in each revolution a fresh color is thus brought behind theexposing-aperture, the next exposure being through the succeeding color,and so on, each color repeating at every third exposure.

The screen 13 (shown in Fig. 4) acts in exactly the same manner as thatdescribed; but I prefer it for use in reproducing photographs. Itconsists simply of a disk of vulcanite or S I ratus, the pin on theshutter engaging the- 2 f e races like material having the apertures 19filled in i with colored transparent material of difierent shades to thecolors employed in the photographic screen. The edge of the disk-isnotched at b and the pin onthe revolving shutter engages in thesenotches, tu rning; the

. screen, as already described.

What I claim as my invention, and desire to secure by Letters Patent,is- V 1. In a cinematograph apparatus, the com-' bination with arevolvingfishutter having a stud upon it of a revolving three-colorscreen pivoted behind the shutter but eccentric to it, and a detachablebrackehcarrying the said screen and secured to the case of theapparevolving screen to bring the three-colored I apertures successivelyinto exposing position substantially as described.

2. In a cinematograph apparatus, the com 26 bination with revolvingshutter having a stud upon it of a three-color revolving screen havingthree radial arms and colored plates fitted between the said arms and abracket carrying the screen and fitted to thesi'de of the casecontaining the apparatus, the pivot of the screen being eccentric to therevolving shutter and the pin upon the latter engaging successively withthe three arms, substantially as described and shown and for the pur=poses specified.

In testimony whereof IThave signed my name to this specification in thepresence of two subscribing witnesses,

WILLIAM NORMAN LASOELLES DAVIDSON 1 Witnesses: g a I WALTER THORNHILL,Jr., 7 WALTER THQRNHILL.

